支气管粘液表皮样癌的临床特征及CT诊断

Clinical characters and diagnosis of CT imaging for bronchial mucoepidermoid carcinoma

目的探讨支气管粘液表皮样癌(mucoepidermoid carcinoma,MEC)临床特征及CT影像特点,以提高对本病的认识能力。方法经手术和病理证实的支气管粘液表皮样癌6例,回顾分析其临床特征和CT影像特点。结果 6例均为低度恶性型,其中病灶位于主支气管2例,为边界清楚的腔内外椭圆形结节,叶支气管3例,为边缘不规则的腔内外生长的类圆形肿块,段支气管1例,为边缘光整的腔内外生长的类圆形肿块。2例瘤内有钙化,3例不均匀轻度强化,2例纵隔及肺门有肿大淋巴结,病理证实为癌转移。6例均有不同程度气道阻塞性改变。结论低度恶性型支气管MEC在CT上表现为边缘光整或不规则的支气管腔内或腔内外结节或肿块,可有钙化,轻度不均匀强化。

Objective To study the findings of clinical characters and computed tomography（CT） for mucoepidermoid carcinoma（MEC） in the bronchial tree and improve the recognition.Methods The clinical characters and CT findings of 6 cases of MEC in the bronchial tree pathologically proved were analyzed and correlated with operative and pathologic reports.Results The 6 patients were proved to be low-grade MEC hisopathologically.The tumors were located at the main bronchus（n=2,showed intra-and-extraluminal well-defined oval nodule）,lobular bronchus（n=3,showed intra-and-extraluminal well-defined round-shaped mass with irregular margin）,segmental bronchus（n=1,showed intra-and-extraluminal well-defined round-shaped mass with a smooth margin）.The calcification within lesion was seen in 2 patients.The tumor had slightly heterogeneous enhancement in 3 patients.Enlarged lymph nodes found in the mediastinum and hili areas which were proved metastasis with pathology.Differential bronchial obstructive changes were found in all 6 patients.Conclusion Low-grade MEC of the bronchial tree is showed airway nodule or mass with smooth or irregular margin,heterogeneous enhancement and calcification on CT.